Semipermeable composite membrane
AssigneeNederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek TNO
InventorsRaymond J. M. Creusen, Franky F. Vercauteren
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Abstract
The invention relates to semipermeable composite membranes having a high sucrose retention and a low salt retention, which membranes are composed of a porous support substrate and a polymer film applied thereon, which polymer film contains an ampholytic polymer. Said ampholytic polymer is entirely or partially made up of repeating units which contain at least one anionic and at least one cationic group. In this way a highly ordered distribution of the anionic and cationic groups over the ampholytic polymer is obtained, which apparently yields the good retention characteristics and reproducibility of the retention characteristics.
Claims11
Semipermeable composite membrane having a high sucrose retention and a low salt retention, comprising a porous support substrate and a polymer film applied to the support and comprising ampholytic groups, wherein the polymer film is formed from film forming reagents and contains ampholytic polymer in an amount of about 20-95% by weight of the polymer film, wherein the ampholytic polymer comprises repeating units containing at least one anionic group and at least one cationic group and no group reactive to the film forming reagents, whereby the ampholytic polymer is present in the polymer in an unbonded state.
Dependencies are inferred from the claim text.